# Thanks ActiveSupport:
# https://github.com/rails/rails/blob/v3.0.9/activesupport/lib/active_support/inflector/methods.rb#L89
#
# Ruby 1.9 introduces an inherit argument for Module#const_get and
# #const_defined? and changes their default behavior.
if Module.method(:const_get).arity == 1
  # Tries to find a constant with the name specified in the argument string:
  #
  # "Module".constantize # => Module
  # "Test::Unit".constantize # => Test::Unit
  #
  # The name is assumed to be the one of a top-level constant, no matter whether
  # it starts with "::" or not. No lexical context is taken into account:
  #
  # C = 'outside'
  # module M
  # C = 'inside'
  # C # => 'inside'
  # "C".constantize # => 'outside', same as ::C
  # end
  #
  # NameError is raised when the name is not in CamelCase or the constant is
  # unknown.
  def constantize(camel_cased_word)
    names = camel_cased_word.split('::')
    names.shift if names.empty? || names.first.empty?

    constant = Object
    names.each do |name|
      constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
    end
    constant
  end
else
  def constantize(camel_cased_word) #:nodoc:
    names = camel_cased_word.split('::')
    names.shift if names.empty? || names.first.empty?

    constant = Object
    names.each do |name|
      constant = constant.const_get(name, false) || constant.const_missing(name)
    end
    constant
  end
end
